Firebase Spark vs Billing

Hi Guys! can anybody tell me the difference of this function:

Can’t we use the full function of firebase without billing?

I would like to know first if possible please tell me…

Firebase free plan doesn’t provides all features and has some limitations.

can you recommend something that I don’t know yet that can use for SMS and OTP that doesn’t required fee? is there anything like that exist?

First of all nothing is free. Every service have their free and paid plan.
But you can use

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Great! I like it, but it would be best if we can use Number OTP Verification since that required in my app. I hope anyone out there know it.

Every sms based otp service are paid. You can search on community for more.